JP2000007924A - Thermoplastic molded products with excellent wear resistance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic resin molded article suitable for a sliding member, in which a fiber-reinforced thermoplastic resin has improved abrasion resistance reduced by the addition of a reinforcing fiber, and is suitable for a sliding member. SOLUTION: This is a thermoplastic resin containing reinforcing fibers, and has a storage elastic modulus of 3.5 × 10 ⁸ Pa to 5.0 × 10 in a temperature range of 30 ° C. to 70 ° C. which is a practical temperature range.
^A thermoplastic resin molded article comprising a fiber-reinforced resin material further containing a material having a range of ⁸ Pa as a slidability imparting agent is provided. The compounding ratio of the slidability-imparting agent is 4 to 10% by weight when the base resin is a polyamide resin, and when the base resin is a thermoplastic resin other than the polyamide resin, based on the total weight of the resin and the reinforcing fibers. 4-20% by weight is suitable. Polytetrafluoroethylene is particularly preferred as the slidability imparting agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin molded article having excellent abrasion resistance, and more particularly, to a fiber-reinforced thermoplastic resin having a storage elastic modulus within a predetermined range as a sliding property imparting agent. The present invention relates to a thermoplastic resin molded article which is added to an appropriate amount to improve sliding performance and processed into various sliding members by an injection molding method or an extrusion molding method.

[0002]

2. Description of the Related Art Conventionally, resins having excellent heat resistance and strength have been used for resin products used for sliding members. In other words, there have been many ideas to improve the wear resistance in a direction to further increase the rigidity of the resin used. As a method of increasing the rigidity, it is common to introduce reinforcing fibers into the resin. However, in this method, especially in a slider member of a slide fastener, wear resistance is extremely poor, and in a reciprocating opening / closing test based on JIS S 3015, opening / closing becomes impossible after about 60 times.
It only has low durability.

[0003]

Usually, in a thermoplastic resin molded article having insufficient rigidity, an appropriate amount of reinforcing fiber is added to compensate for its strength. However, in terms of abrasion resistance, there is a reality that the reinforcing fibers function as abrasives, and therefore, are significantly reduced. The purpose of the present invention, in such a fiber-reinforced thermoplastic resin, in order to improve the wear resistance significantly reduced by the addition of reinforcing fibers,
An object of the present invention is to provide a thermoplastic resin molded article suitable for a sliding member by adding a suitable amount of a material having an appropriate storage elastic modulus within a practical temperature range as a sliding property imparting agent to improve abrasion resistance.

[0004]

According to a basic aspect of the present invention, there is provided a thermoplastic resin containing a reinforcing fiber, wherein the thermoplastic resin contains a practical temperature range of 30 ° C. to 70 ° C. Storage elastic modulus in the temperature range of 3.5 × 10 ⁸
There is provided a thermoplastic resin molded product comprising a fiber reinforced resin material further containing a material having a range of Pa to 5.0 × 10 ⁸ Pa as a slidability imparting agent.

According to a more specific embodiment of the present invention, a polyamide resin containing reinforcing fibers, which has a storage elastic modulus of 3.5 in a temperature range of 30 ° C. to 70 ° C. which is a practical temperature range. × 10 ⁸ Pa to 5.0 × 10 ⁸ Pa
A thermoplastic resin molded product comprising a fiber reinforced resin material further containing a material having a range of 4 to 10% by weight based on the total weight of the resin and the reinforcing fibers as a slidability imparting agent. Is done.

According to another more specific aspect of the present invention,
A thermoplastic resin containing a reinforcing fiber (excluding polyamide resin), which has a storage elastic modulus of 3.5 × 10 ⁸ Pa to 5.0 × 10 in a temperature range of 30 ° C. to 70 ° C. which is a practical temperature range. ^A material in the range of ⁸ Pa is used as a slidability imparting agent in an amount of 4 to 20% by weight based on the total weight of the resin and the reinforcing fibers.
And a thermoplastic resin molded product characterized by comprising a fiber reinforced resin material further containing at a ratio of:

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted intensive studies to improve the abrasion resistance of a thermoplastic resin reinforced with reinforcing fibers, and have shown the viscoelastic behavior of a material used as a sliding property imparting agent. Elastic modulus, ie, the storage elastic modulus indicating the elasticity without energy dissipation and the loss elastic modulus related to energy dissipation (Seiichi Nakahama et al., “Essential Polymer Science,
Kodansha Scientific, 1998, 218-2
Focusing on the correlation between the temperature dependence of the slidability-imparting agent and the abrasion resistance of the fiber-reinforced resin to which the slidability-imparting agent is added, a material having an appropriate storage elastic modulus in a practical temperature range is used. When an appropriate amount is added to the fiber reinforced resin as an imparting agent, the obtained material retains a moderate elasticity even in a practical temperature range (generally 30 to 70 ° C.) in which the temperature is slightly increased due to frictional heat caused by sliding of the sliding member, It has been found that the wear resistance is greatly improved, and the present invention has been completed. That is, the present invention provides a fiber-reinforced thermoplastic resin having a storage elastic modulus of 3.5 × 10 ⁸ Pa to 5.0 in a practical temperature range of 30 ° C. to 70 ° C.
By adding an appropriate amount of a material in the range of × 10 ⁸ Pa as a slidability-imparting agent, it is characterized by imparting abrasion resistance that cannot be originally provided to those molded products. Specifically, to the reinforcing fiber and the thermoplastic resin, or to the thermoplastic resin containing the reinforcing fiber, a material having a storage elastic modulus in the above range was mixed as a sliding property imparting agent at a predetermined quantitative ratio. Thereafter, by forming a molded article processed by an injection molding method or an extrusion molding method, excellent wear resistance can be imparted.

As described above, the wear resistance of a sliding part made of a thermoplastic resin containing reinforcing fibers such as glass fiber is compared with a sliding part made of a similar thermoplastic resin containing no reinforcing fibers. At this time, when evaluated by the number of times of sliding durability and the amount of wear of the sliding component, the number of times of durability is greatly reduced, the amount of wear is increased, and the deterioration is extremely deteriorated. This is because reinforcing fibers such as glass fibers act as a reinforcing material when present in a molded article, but once released on the surface of the molded article, they are naturally harder than the thermoplastic resin which is a matrix, This is because it acts as an abrasive and cuts the sliding component itself and the mating component. The use of reinforcing fibers is a prerequisite for application to members that require high strength, and it is considered that the use of such fibers is inevitable when a thermoplastic resin is used for the members.

In view of the above-mentioned conventional ideas and the problems resulting therefrom, the present invention has been achieved from the following viewpoints. In other words, the thermoplastic resin molded article containing these reinforcing fibers is provided with a more flexible material, that is, a material having a storage elastic modulus and a loss elastic modulus lower than that of the fiber-reinforced thermoplastic resin within a predetermined temperature range, and is provided with slidability. The purpose is to prevent abrasion by mixing an appropriate amount as an agent. The appropriate blending ratio of the slidability-imparting agent differs depending on the type of the base resin, and is 4 to 10% by weight in the case of a polyamide resin, based on the total weight of the resin and the reinforcing fibers, and the heat other than the polyamide resin. In the case of a plastic resin, 4 to 20% by weight is appropriate. If the compounding ratio of the slidability-imparting agent is less than the above range, sufficient abrasion resistance cannot be obtained. On the other hand, if it is more than the above range, the strength of the molded article decreases, and the slidability-imparting agent is generally used. Since the material suitable for is expensive, it is a major factor that increases the manufacturing cost of the molded product, and is not preferable in terms of economy.

The above-mentioned slidability-imparting agent is used in a temperature range of 30 to 70.degree.
Any material having a storage modulus of 5.0 × 10 ⁸ Pa can be used, and is not limited to a specific material. For example, polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoroethylene copolymer (FEP), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), modified tetrafluoroethylene-ethylene copolymer (E / TFE polymer), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), chlorotrifluoroethylene
Fluororesins such as an ethylene copolymer (E / CTFE polymer) and polyvinyl fluoride (PVF), polyethylene and the like are listed, and among these, polytetrafluoroethylene is preferable.

The operation of the present invention will be described below with reference to the drawings. FIG. 1 shows a test piece prepared from a fiber reinforced resin in which 30% by weight of glass fiber (GF) is blended with polybutylene terephthalate (PBT), and polytetrafluoroethylene at a ratio of 10% by weight to the fiber reinforced resin. 5 shows a change in the amount of wear in a wear resistance test for a test piece made of a fiber reinforced resin mixed with ethylene (PTFE). The abscissa in the figure indicates the test atmosphere temperature, and the ordinate indicates the remaining weight of the test piece after the test is performed for a predetermined time as a percentage by weight, where the weight of the test piece before the wear test is 100%. .
The wear test is performed from the top of a rotating disk-shaped wear partner.
A method of pressing a test piece for abrasion test with a weight was adopted. The load during the test was 0.5 kgf / mm ² and the speed was 1
It was set to be 9.4 m / min. Test time is 3
0 minutes. As shown in FIG. 1, in the case of a fiber-reinforced resin obtained by adding an appropriate amount of a resin having a low storage modulus (PTFE), which is inferior in strength, to a fiber-reinforced thermoplastic resin as a sliding property imparting agent, The effect is not seen around room temperature around ℃, but in the temperature range above 30 ℃,
Although the absolute amount of abrasion increases in any of the fiber reinforced resins, the amount of the abrasion is reduced as compared with the case where no resin having a low storage modulus is added, and improvement in abrasion resistance is recognized. This tendency continues up to around 80 ° C.

As described above, the abrasion resistance of the fiber-reinforced thermoplastic resin is within a temperature range of about 30 ° C. to about 80 ° C., and the resin (PT) having a lower storage modulus than the fiber-reinforced resin is used.
It is greatly improved by adding an appropriate amount of FE) as a slidability imparting agent. The temperature dependency of the storage elastic modulus of the slidability imparting agent (PTFE) is as shown in FIG. The storage elastic modulus was measured using a dynamic viscoelasticity automatic measuring device.
FIG. 2 shows the storage elastic modulus of PTFE and the fiber-reinforced thermoplastic resin (PBT + GF30w) to which PTFE was not added.
The storage elastic modulus (t%) is also shown, and it is easily understood that the storage elastic modulus of the fiber-reinforced thermoplastic resin without PTFE is large within the practical temperature range.

More importantly, the effect of the material added as the slidability-imparting agent is not exhibited at 20 ° C., but is exhibited only when the temperature exceeds about 30 ° C. This indicates that the temperature dependency of the slidability imparting agent greatly affects the wear resistance of the fiber-reinforced thermoplastic resin. As a specific numerical value, it is important that the storage elastic modulus of the slidability imparting agent at a temperature of 30 ° C. or more is 5 × 10 ⁸ Pa or less. As for the effect to be exerted at temperatures exceeding 30 ° C., when a sliding part is slid, for example, when a slider part for a slide fastener is attached to a fastener chain and repeatedly reciprocated at a normal temperature, the sliding part becomes The fact that the temperature rose to 35 ° C. is considered to be a practically effective range.

In order to more reliably prove the above points,
Materials having different storage elastic moduli were selected as materials to be blended as the slidability imparting agent, and an abrasion resistance test and a measurement of the storage elastic modulus were performed. That is, polyethylene (PE) having a storage elastic modulus as shown in FIG. 3 was used as a slidability imparting agent, and 50% by weight of glass fiber was added to a polyamide resin (Lenny 1022HS, manufactured by Mitsubishi Engineering-Plastics Corporation). A test piece prepared from a fiber reinforced resin containing (GF) and 5
Abrasion resistance tests were performed on test pieces made from fiber reinforced resins in which polyethylene was blended at a ratio of 10% by weight, 10% by weight, and 20% by weight, and comparisons were made. FIG. 4 shows the results. As shown in FIG. 4, it became clear that the effect as a slidability imparting agent appears remarkably around 60 ° C. The horizontal axis in the figure indicates the test atmosphere temperature,
The vertical axis represents the weight of the test piece before the abrasion test as 100%,
The remaining amount of the test piece after performing the test for a predetermined time is shown in percentage by weight. The abrasion test was performed in the same manner as the abrasion test described with reference to FIG.

Also in FIG. 4, attention should be paid to the fact that the abrasion resistance is improved around 60 ° C. That is, as shown in FIG. 3, the storage elastic modulus of polyethylene (slidability imparting agent) at around 60 ° C. is exactly 5 × 10 ⁸ Pa or less. FIG. 5 shows the range of the storage modulus of the material used as the slidability imparting agent in the present invention. As shown in FIG. 5, the storage elastic modulus of a material used as a sliding property imparting agent for a fiber-reinforced thermoplastic resin molded article is 5 × 10 ⁸ Pa or less in a temperature range of 30 ° C. to 70 ° C. It is an important condition to exert. Preferably, if the storage elastic modulus of the slidability-imparting agent is 3.5 × 10 ⁸ Pa or more, the high strength, which is the original purpose of the fiber-reinforced thermoplastic resin, is not impaired, and it is practical. Is considered relevant. Further, the temperature range up to 70 ° C. is considered to be a practical temperature range from the usage environment of a sliding member considered as a specific product application, for example, a slider for a slide fastener.

As described above, a major point of the present invention is that the fiber-reinforced thermoplastic resin is heated from 30 ° C. to 7 ° C.
In the temperature range of 0 ° C., the storage elastic modulus is 3.5 × 10 ⁸
The point is that a material having a range of Pa to 5.0 × 10 ⁸ Pa is added and used as a slidability imparting agent. In addition, as shown in FIG. 2, polytetrafluoroethylene conforms well to the condition of the storage elastic modulus of the material that can be used as the slidability imparting agent in the present invention. Therefore, it is more preferable to use this polytetrafluoroethylene or its similar compound as a slidability-imparting agent, together with its chemical stability.

Furthermore, in order to better express the abrasion resistance, an appropriate amount of a slidability imparting agent (polyethylene) for a fiber-reinforced thermoplastic resin (polyamide resin (Renny 1022HS) + 50% by weight of glass fiber) is used. The blending amount was investigated. FIG. 6 shows the result. In FIG. 6, the horizontal axis represents the content of polyethylene, and the vertical axis represents the residual amount of the test piece after the abrasion test (100% before the test) in percentage by weight. The abrasion test was performed in the same manner as the abrasion test described with reference to FIG.

As is apparent from FIG. 6, the amount of the effective amount of the slidability imparting agent added to the fiber-reinforced thermoplastic resin is at least 4% by weight based on the fiber-reinforced thermoplastic resin. . When the amount of the slidability-imparting agent is less than 4% by weight, no improvement in wear resistance is observed. Conversely, when the amount of the slidability-imparting agent is increased, the abrasion resistance is improved, but the strength which should be the primary purpose of using a fiber-reinforced thermoplastic resin molded article is greatly impaired, and If an expensive material such as polytetrafluoroethylene is used, it leads directly to an increase in cost, so that there is no practical use. Therefore, the upper limit of the amount of the slidability-imparting agent is 10% by weight when the matrix resin is a polyamide resin, and 20% by weight when the other thermoplastic resin is used, based on the fiber-reinforced thermoplastic resin. %.

As the thermoplastic resin used in the present invention, a resin having high rigidity is basically used, and examples thereof include polybutylene terephthalate, polyethylene terephthalate, polycarbonate, and polyamide. Furthermore, it is desirable that the thermoplastic resin has a Tg higher than the glass transition point Tg of the slidability imparting agent. This is a certain hardness difference between the thermoplastic resin and the slidability imparting agent,
That is, if there is no difference in storage elastic modulus, there is no merit of using a soft material as a slidability imparting agent. In view of the above, polybutylene terephthalate or a polyamide resin is particularly preferably used.

The reinforcing fibers used in the present invention are blended for the purpose of increasing the strength of the thermoplastic resin. However, as described above, these reinforcing fibers cause a great decrease in abrasion resistance as compared with a similar thermoplastic resin containing no reinforcing fibers. Therefore,
The best way to improve abrasion resistance is to eliminate or significantly reduce the reinforcing fibers that cause it. However, for resin sliding members, it is necessary to simultaneously aim at improving wear resistance and high strength, and when using a thermoplastic resin, use of these reinforcing fibers is avoided if improvement in strength is required as a performance. It is not possible. Therefore, the balance between the strength and the abrasion resistance is as follows.
It is important to keep the content within the range of ６０60% by weight. As the reinforcing fibers, lightweight and inexpensive glass fibers, carbon fibers, metal fibers, and the like are used, but they can be used alone or in a mixed form of two or more of them.

In the present invention, thermoplastic resins, reinforcing fibers and slidability-imparting agents produced by known methods are used without any particular limitation. Furthermore, polytetrafluoroethylene, polybutylene terephthalate, polyamide,
Glass fibers, carbon fibers and metal fibers produced by a known method can be used without limitation.

The method for producing a molded article according to the present invention is not particularly limited. If the most typical production method is exemplified, a predetermined amount of glass fiber provided with compatibility by surface treatment is previously mixed with polybutylene terephthalate by a kneading device, and further, with respect to this glass fiber-containing polybutylene terephthalate. A predetermined amount of polytetrafluoroethylene is added, and kneading is further performed. By molding the kneaded resin with an injection molding machine, a high-strength thermoplastic resin molded article having excellent wear resistance can be obtained easily and with good reproducibility. The kneading temperature is not particularly limited, but may be kneaded at the melting temperature of the thermoplastic resin to be used. Further, also for these kneading methods, a method without using a kneading apparatus, that is, a method called dry blending may be used, and the kneading order is not particularly limited, and the kneading order may be any order or all components. Can be simultaneously kneaded.

The thermoplastic resin molded article excellent in abrasion resistance according to the present invention has a great effect particularly when used as a slider member for a slide fastener. For example,
Abrasion resistance of a slider for a slide fastener formed by using and mixing polybutylene terephthalate as a thermoplastic resin, glass fiber as a reinforcing fiber, and polytetrafluoroethylene as a slidability-imparting agent was measured according to JIS S. When evaluated by the number of times of reciprocating opening and closing of the slide fastener based on No. 3015, when polytetrafluoroethylene was added as a slidability imparting agent, about 4,4
In contrast to the case where a slider molded from only the same glass fiber-containing polybutylene terephthalate to which no slidability imparting agent is added is used, the slider can endure only about 60 times of opening and closing, whereas it can withstand 000 times of opening and closing. It is.

The thermoplastic resin molded article of the present invention can be applied to slider members for slide fasteners made of various synthetic resins, and some embodiments thereof are shown in FIGS. FIG.
Shows a slide fastener 1 used for opening and closing an opening of clothes or bags, for example, and has a product form in which upper and lower ends of a pair of left and right fastener stringers 2 are cut off. The fastener stringer 2 is composed of a synthetic resin fastener tape 3 and a row of synthetic resin elements (coil-shaped elements) 4 fastened to their opposing edges. The fastener tape 3 is formed by weaving and / or knitting a synthetic resin fiber,
Alternatively, it is made of a nonwoven fabric or a synthetic resin sheet. As the element 4, an injection type in which individual elements are injection-molded and fastened to the edge of the fastener tape at the same time, a coil-shaped element in which a synthetic resin monofilament is wound in a coil shape, or a horizontal U-shape in a plane A continuous element such as a so-called zigzag element in which a bent portion is continuously formed in a zigzag shape along the longitudinal direction alternately up and down, and two connecting cords (core cords) separated in parallel in the longitudinal direction by extrusion molding. There are various types, such as a ladder-shaped extruded element in which both ends of individual elements are connected to each other and bent in a U-shape around a longitudinal center line.
Reference numeral 5 is a slider for sliding and meshing / separating on opposing elements, and is formed from a fiber-reinforced thermoplastic resin to which the slidability-imparting agent of the present invention is added.

The slide fastener 1a shown in FIG. 8 has a form in which the upper end portion of each fastener stringer 2 is cut, and a lower stop portion 6 is formed by welding a predetermined lower portion of the row of the meshed elements 4. Figure 7
Is different from the slide fastener shown in FIG. On the other hand, the slide fastener 1b shown in FIG. 9 has an upper stopper 7 at an upper end of a row of elements 4b fixed to a fastener tape 3b of each fastener stringer 2b, and a lower stopper 8 at a lower end.
Is different from the slide fastener shown in FIG.

FIG. 10 shows an open slide fastener 1c.
Is shown. At the lower end of the fastener tape 3c of each fastener stringer 2c, a reinforcing sheet-like member (taffeta) 9 is welded via an adhesive layer (not shown). A box bar 12 constituting the separable bottom end stop 10 is provided on one inner edge of the opposing reinforcing sheet-like member 9.
A box body 11 integrally formed with the reinforcing member is attached, and a wing pin 13 is attached to an inner edge of the other reinforcing sheet-like member 9. Reference numeral 14 denotes a core string which is inserted in the spiral inner space of the coil element 4c in the longitudinal direction, and reference numeral 15 denotes a sewing thread obtained by sewing the core string 14 and the coil element 4c to the longitudinal edge of the fastener tape 3c. is there.

When sliders for various slide fasteners as described above are molded from the fiber-reinforced thermoplastic resin to which the slidability-imparting agent of the present invention is added, the slider obtained exhibits extremely high reciprocating open / close durability. Conventionally, the difficulty of manufacturing a high-strength, high-abrasion-resistant, durable synthetic resin slider has been a cause of the inability to convert all the components of the slide fastener into a synthetic resin. However, since the present invention can produce a slider made of synthetic resin having high strength and high wear resistance and excellent durability, all the components of the slide fastener can be produced with synthetic resin. As a result, even if products such as clothes and bags with slide fasteners are discarded after use, the slide fasteners can be collected and reused, contributing to the reduction of industrial waste generation, recycling, It is extremely significant from the viewpoint of environmental protection.

[0028]

EXAMPLES The present invention will be described below in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 In this example, glass fiber-containing polybutylene terephthalate (Tuffpet PBT1101G30, manufactured by Mitsubishi Rayon Co., Ltd., glass fiber content: 30% by weight) was selected and used as a reinforcing fiber-containing thermoplastic resin. Raw material 1-
A). Further, in a temperature range of 30 ° C. to 70 ° C.,
Storage elastic modulus from 3.5 × 10 ⁸ Pa to 5.0 × 10 ⁸ P
Polytetrafluoroethylene is selected as the slidability imparting agent in the range of a, and 5% by weight (raw material 1-B) or 10% by weight (raw material 1-C) based on the above glass fiber-containing polybutylene terephthalate. The contained pellets were prepared. First, these pellets were heated at 120 ° C under reduced pressure for 4 hours.
After drying for a time, and immediately after drying, each resin was molded by an injection molding machine as a slider for a slide fastener to obtain molded product 1-A, 1-B and 1-C sliders.

Each of the molded products 1-A, 1-B and 1-C was subjected to a slider reciprocating open / close durability test based on JIS S 3015. The stroke of the reciprocating motion of the slider is 3 inches (76.2 mm), and the speed is 30.
Round trip / minute. Table 1 shows the results. As shown in Table 1, the durability of the molded article 1-A containing no polytetrafluoroethylene in the slider reciprocating open / close durability test was 66 times on average for 5 times. The molded article 1-B containing 5% by weight has an average durability of 4,129 times, and the molded article 1-C containing 10% by weight of polytetrafluoroethylene has an average durability of 980 times. It was much higher than that without ethylene. Thus, by adding a material having a storage elastic modulus within a predetermined range as a slidability imparting agent to a fiber-reinforced thermoplastic resin in a predetermined amount, abrasion resistance is significantly improved, and the sliding member is obtained. As a result, the reciprocating open / close durability of the slider for the slide fastener was greatly improved.

[Table 1]

Example 2 In this example, a glass fiber-containing polyamide resin (manufactured by Mitsubishi Engineering-Plastics Co., Ltd., Reny 1022HS, glass fiber content 50% by weight) was selected and used as a reinforcing fiber-containing thermoplastic resin. (Raw material 2-
A). Further, in a temperature range of 30 ° C. to 70 ° C.,
Storage elastic modulus from 3.5 × 10 ⁸ Pa to 5.0 × 10 ⁸ P
Polytetrafluoroethylene is selected as the slidability-imparting agent in the range of a, and 5% by weight (raw material 2-B) or 7% by weight based on the glass fiber-containing polyamide resin.
(Raw material 2-C) A pellet was prepared. Furthermore, glass fiber-containing polyamide resin (manufactured by Mitsubishi Engineering-Plastics Corporation, Reny 1022HS,
Pellets containing 10% by weight of polytetrafluoroethylene based on 45% by weight of glass fiber (raw material 2)
-D) was also prepared. These pellets are heated at 120 ° C under reduced pressure.
For 4 hours. Immediately after drying, each resin is molded by an injection molding machine as a slider for a slide fastener, and molded products 2-A, 2-B and 2-C are formed.
And 2-D sliders were obtained.

Molded articles 2-A, 2-B, 2-C and 2-D
JIS S in the same manner as in the first embodiment.
A slider reciprocating open / close durability test based on No. 3015 was performed. Table 2 shows the results. As shown in Table 2, the endurance frequency of the molded article 2-A containing no polytetrafluoroethylene in the slider reciprocating open / close durability test was 353 times on average for 5 times. The durability of molded article 2-B containing 5% by weight is 1,151 times on average, and 7% by weight of polytetrafluoroethylene.
The average durability of the molded product 2-C containing 2,204 was 2,204, and that of the molded product 2-D containing 10% by weight of polytetrafluoroethylene was 4,681, on average. Was significantly higher than those that did not include. As described above, also in this embodiment, by adding a material having a storage elastic modulus within a predetermined range as a slidability imparting agent to a fiber-reinforced thermoplastic resin in a predetermined amount, abrasion resistance is greatly improved. As a result, the reciprocating open / close durability of the slider for the slide fastener as the sliding member was significantly improved.

[Table 2]

[0033]

As described above, the thermoplastic resin molded article of the present invention is obtained by adding a fiber-reinforced thermoplastic resin to a resin at a temperature of 30.degree.
The storage elastic modulus is 3.5 × 10 ⁸ in the practical temperature range of 0 ° C.
Since a material in the range of Pa to 5.0 × 10 ⁸ Pa is added in an appropriate amount as a slidability imparting agent, while maintaining the high strength imparted by the addition of the reinforcing fiber,
It shows significantly improved abrasion resistance, especially in the practical temperature range where the temperature rises due to the generation of frictional heat due to sliding. Therefore, the thermoplastic resin molded article of the present invention can be advantageously used as various kinds of sliding parts, and particularly exhibits extremely high reciprocating open / close durability when applied to a slider for a slide fastener.

[Brief description of the drawings]

FIG. 1 shows polybutylene terephthalate containing 30% by weight of glass fiber and polytetrafluoroethylene added thereto.
4 is a graph showing a change in a wear amount in a wear resistance test of a fiber reinforced resin added by weight%.

FIG. 2 Polytetrafluoroethylene and glass fiber 3
It is a graph which shows the temperature change of the storage elastic modulus of 0 weight% containing polybutylene terephthalate.

FIG. 3 is a graph showing the temperature change of the storage modulus of polyethylene and polybutylene terephthalate containing 30% by weight of glass fiber.

FIG. 4 shows a polyamide resin containing 50% by weight of glass fiber and polyethylene with 5% by weight and 10% by weight, respectively.
4 is a graph showing a change in abrasion amount in an abrasion resistance test of a fiber reinforced resin to which a fiber reinforced resin and 20% by weight are added.

FIG. 5 is a graph showing a storage elastic modulus range of a material used as a slidability imparting agent in the present invention.

FIG. 6 is an abrasion resistance test using a test piece made of a polyamide resin containing 50% by weight of glass fiber and a fiber reinforced resin containing 2.5% by weight, 5% by weight, 10% by weight and 20% by weight of polyethylene respectively. It is a graph showing a result.

FIG. 7 is a plan view showing an example of a synthetic resin slide fastener.

FIG. 8 is a plan view showing another example of a synthetic resin slide fastener.

FIG. 9 is a plan view showing still another example of a synthetic resin slide fastener.

FIG. 10 is a partially broken plan view showing still another example of the slide fastener made of synthetic resin.

[Explanation of symbols]

 1, 1a, 1b, 1c Slide fastener 2, 2b, 2c Fastener stringer 3, 3b, 3c Fastener tape 4, 4b, 4c Element 5 Slider 6 Lower stop 7 Upper stop 8 Lower stop 9 Reinforcement sheet member 10 Separation insert

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 77/00 C08L 77/00 F term (Reference) 3B098 AA02 AB01 AB07 CB02 CC25 DA01 DA02 DB02 4F006 AA35 AA38 AA55 AB19 BA02 CA00 DA00 4J002 BB032 BB102 BD122 BD132 BD152 BD162 CF061 CF071 CG001 CL001 DA016 DB006 DL006 FA046 FD016 FD172 GC00

Claims (8)

[Claims] 1. A thermoplastic resin containing reinforcing fibers, which has a storage elastic modulus of 3.5 × 10 ⁸ Pa to 5.0 × 10 in a practical temperature range of 30 ° C. to 70 ° C.
^A thermoplastic resin molded product comprising a fiber-reinforced resin material further containing a material having a range of ⁸ Pa as a slidability imparting agent. 2. A polyamide resin containing reinforcing fibers, which has a storage elastic modulus of 3.5 × 10 ⁸ Pa to 5.0 × in a practical temperature range of 30 ° C. to 70 ° C.
10 ⁸ Pa thermoplastic resin molding that material characterized by comprising the fiber-reinforced resin material further contains a proportion of 4-10% by weight of the total weight of the resin and the reinforcing fibers as a sliding property-imparting agent in the range of Goods. 3. A thermoplastic resin containing a reinforcing fiber (excluding a polyamide resin), which is in a practical temperature range of 30.
3.5 × storage elastic modulus in the temperature range of 70 ° C. to 70 ° C.
A fiber reinforced resin material further containing a material in the range of 10 ⁸ Pa to 5.0 × 10 ⁸ Pa as a slidability imparting agent in a ratio of 4 to 20% by weight based on the total weight of the resin and the reinforcing fibers. A thermoplastic resin molded product characterized by the following. 4. The thermoplastic resin molded article according to claim 3, wherein the thermoplastic resin is polybutylene terephthalate. 5. The thermoplastic resin molded article according to claim 1, wherein the material used as the slidability imparting agent is polytetrafluoroethylene. 6. The thermoplastic resin molded article according to claim 1, wherein the content of the reinforcing fiber is 20 to 60% by weight of the weight of the thermoplastic resin. 7. The heat as claimed in claim 1, wherein the reinforcing fiber is made of any one of glass fiber, carbon fiber and metal fiber or a combination of two or more thereof. Plastic resin molded product. 8. The thermoplastic resin molded product according to claim 1, wherein the molded product is a slider part for a slide fastener.